I watch Big Bang Theory a lot and notice they sometimes speak to each other in Klingon and I remember at one point seeing a poster, when I was little, with a bunch of Klingon phrases for like, "where is the bathroom" and "please kill me honorably" or something like that.
So, is the Klingon language as it was used in the show an actual fully-fledged language, one that you could learn and use as a primary means of communication (assuming there are people who can understand you), or did it just develop when certain phrases were needed in the shows and movies?